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NPJ Digit Med. 2019 Aug 22;2:82. doi: 10.1038/s41746-019-0154-5. eCollection 2019.

eHealth tools for the self-testing of visual acuity: a scoping review.

Author information

1
1Division of Neuroscience and Experimental Psychology, University of Manchester and the Manchester Academic Health Sciences Centre, Manchester, UK.
2
2Manchester Centre for Audiology and Deafness, University of Manchester and the Manchester Academic Health Sciences, Manchester, UK.
3
3University of Dundee, Dundee, UK.
4
4Manchester University NHS Foundation Trust, Manchester, UK.
5
5Division of Pharmacy & Optometry, University of Manchester and the Manchester Academic Health Sciences Centre, Manchester, UK.
6
6Global Brain Health Institute, Trinity College Dublin, Dublin, Ireland.

Abstract

Uncorrected refractive error is a major cause of vision impairment, and is indexed by visual acuity. Availability of vision assessment is limited in low/middle-income countries and in minority groups in high income countries. eHealth tools offer a solution; two-thirds of the globe own mobile devices. This is a scoping review of the number and quality of tools for self-testing visual acuity. Software applications intended for professional clinical use were excluded. Keyword searches were conducted on Google online, Google Play and iOS store. The first 100 hits in each search were screened against inclusion criteria. After screening, 42 tools were reviewed. Tools assessed near and distance vision. About half (n = 20) used bespoke optotypes. The majority (n = 25) presented optotypes one by one. Four included a calibration procedure. Only one tool was validated against gold standard measures. Many self-test tools have been published, but lack validation. There is a need for regulation of tools for the self-testing of visual acuity to reduce potential risk or confusion to users.

KEYWORDS:

Diagnosis; Neuroscience; Refractive errors; Vision disorders; Visual system

Conflict of interest statement

Competing interestsThe authors declare no competing interests.

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